HVACR Posted November 8, 2017 Share Posted November 8, 2017 What is the RJ11 port for on a 16 channel controller? Just curious. Thanks HVACR Link to comment Share on other sites More sharing options...
Mr. P Posted November 8, 2017 Share Posted November 8, 2017 4 minutes ago, HVACR said: What is the RJ11 port for on a 16 channel controller? Just curious. Thanks HVACR The RJ11 connector can be used the same way as the cat5, data and power. Link to comment Share on other sites More sharing options...
HVACR Posted November 9, 2017 Author Share Posted November 9, 2017 I can use a standard phone line wire to link controllers? Link to comment Share on other sites More sharing options...
Mr. P Posted November 9, 2017 Share Posted November 9, 2017 31 minutes ago, HVACR said: I can use a standard phone line wire to link controllers? Yes but most use it as a backup if the RJ45 connectors go bad. Link to comment Share on other sites More sharing options...
crewdog89 Posted November 9, 2017 Share Posted November 9, 2017 HVACR, One of the connectors went out on one of my controllers last year, so I tried to use the phone line jacks, and the controller began to smoke. No idea why, but I decided to stay away from using them. vern Link to comment Share on other sites More sharing options...
LOR Staff Posted November 9, 2017 Share Posted November 9, 2017 Back before CAT(whatever) became popular and before it was the de-facto standard for communications, it was EXPENSIVE. Phone wire on the other hand was CHEAP and already in use on long distance RS485 networks. It is a vestige of those times. The RJ11 is, as Mr. P stated, a good backup in case one of the RJ45 fails. Twisted Pair (using the RJ45) is always preferred, but the RJ11 with phone line will work in a pinch. Link to comment Share on other sites More sharing options...
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